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v4.10.11
  1/*
 
 
  2 *  S390 version
  3 *    Copyright IBM Corp. 1999, 2012
  4 *    Author(s): Hartmut Penner (hp@de.ibm.com),
  5 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
  6 *
  7 *  Derived from "arch/i386/kernel/setup.c"
  8 *    Copyright (C) 1995, Linus Torvalds
  9 */
 10
 11/*
 12 * This file handles the architecture-dependent parts of initialization
 13 */
 14
 15#define KMSG_COMPONENT "setup"
 16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 17
 18#include <linux/errno.h>
 19#include <linux/export.h>
 20#include <linux/sched.h>
 21#include <linux/kernel.h>
 22#include <linux/memblock.h>
 23#include <linux/mm.h>
 24#include <linux/stddef.h>
 25#include <linux/unistd.h>
 26#include <linux/ptrace.h>
 27#include <linux/random.h>
 28#include <linux/user.h>
 29#include <linux/tty.h>
 30#include <linux/ioport.h>
 31#include <linux/delay.h>
 32#include <linux/init.h>
 33#include <linux/initrd.h>
 34#include <linux/bootmem.h>
 35#include <linux/root_dev.h>
 36#include <linux/console.h>
 37#include <linux/kernel_stat.h>
 38#include <linux/dma-contiguous.h>
 39#include <linux/device.h>
 40#include <linux/notifier.h>
 41#include <linux/pfn.h>
 42#include <linux/ctype.h>
 43#include <linux/reboot.h>
 44#include <linux/topology.h>
 45#include <linux/kexec.h>
 46#include <linux/crash_dump.h>
 47#include <linux/memory.h>
 48#include <linux/compat.h>
 49
 50#include <asm/ipl.h>
 51#include <asm/facility.h>
 
 52#include <asm/smp.h>
 53#include <asm/mmu_context.h>
 54#include <asm/cpcmd.h>
 55#include <asm/lowcore.h>
 56#include <asm/irq.h>
 57#include <asm/page.h>
 58#include <asm/ptrace.h>
 59#include <asm/sections.h>
 60#include <asm/ebcdic.h>
 
 61#include <asm/kvm_virtio.h>
 62#include <asm/diag.h>
 63#include <asm/os_info.h>
 64#include <asm/sclp.h>
 65#include <asm/sysinfo.h>
 66#include <asm/numa.h>
 67#include "entry.h"
 
 
 
 
 
 
 68
 69/*
 70 * Machine setup..
 71 */
 72unsigned int console_mode = 0;
 73EXPORT_SYMBOL(console_mode);
 74
 75unsigned int console_devno = -1;
 76EXPORT_SYMBOL(console_devno);
 77
 78unsigned int console_irq = -1;
 79EXPORT_SYMBOL(console_irq);
 80
 81unsigned long elf_hwcap __read_mostly = 0;
 82char elf_platform[ELF_PLATFORM_SIZE];
 83
 84unsigned long int_hwcap = 0;
 85
 86int __initdata memory_end_set;
 87unsigned long __initdata memory_end;
 88unsigned long __initdata max_physmem_end;
 89
 90unsigned long VMALLOC_START;
 91EXPORT_SYMBOL(VMALLOC_START);
 92
 93unsigned long VMALLOC_END;
 94EXPORT_SYMBOL(VMALLOC_END);
 95
 96struct page *vmemmap;
 97EXPORT_SYMBOL(vmemmap);
 98
 99unsigned long MODULES_VADDR;
100unsigned long MODULES_END;
101
102/* An array with a pointer to the lowcore of every CPU. */
103struct lowcore *lowcore_ptr[NR_CPUS];
104EXPORT_SYMBOL(lowcore_ptr);
105
106/*
107 * This is set up by the setup-routine at boot-time
108 * for S390 need to find out, what we have to setup
109 * using address 0x10400 ...
110 */
111
112#include <asm/setup.h>
113
114/*
115 * condev= and conmode= setup parameter.
116 */
117
118static int __init condev_setup(char *str)
119{
120	int vdev;
121
122	vdev = simple_strtoul(str, &str, 0);
123	if (vdev >= 0 && vdev < 65536) {
124		console_devno = vdev;
125		console_irq = -1;
126	}
127	return 1;
128}
129
130__setup("condev=", condev_setup);
131
132static void __init set_preferred_console(void)
133{
134	if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
 
 
135		add_preferred_console("ttyS", 0, NULL);
136	else if (CONSOLE_IS_3270)
137		add_preferred_console("tty3270", 0, NULL);
138	else if (CONSOLE_IS_VT220)
139		add_preferred_console("ttyS", 1, NULL);
140	else if (CONSOLE_IS_HVC)
141		add_preferred_console("hvc", 0, NULL);
142}
143
144static int __init conmode_setup(char *str)
145{
146#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
147	if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
148                SET_CONSOLE_SCLP;
149#endif
150#if defined(CONFIG_TN3215_CONSOLE)
151	if (strncmp(str, "3215", 5) == 0)
152		SET_CONSOLE_3215;
153#endif
154#if defined(CONFIG_TN3270_CONSOLE)
155	if (strncmp(str, "3270", 5) == 0)
156		SET_CONSOLE_3270;
157#endif
158	set_preferred_console();
159        return 1;
160}
161
162__setup("conmode=", conmode_setup);
163
164static void __init conmode_default(void)
165{
166	char query_buffer[1024];
167	char *ptr;
168
169        if (MACHINE_IS_VM) {
170		cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
171		console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
172		ptr = strstr(query_buffer, "SUBCHANNEL =");
173		console_irq = simple_strtoul(ptr + 13, NULL, 16);
174		cpcmd("QUERY TERM", query_buffer, 1024, NULL);
175		ptr = strstr(query_buffer, "CONMODE");
176		/*
177		 * Set the conmode to 3215 so that the device recognition 
178		 * will set the cu_type of the console to 3215. If the
179		 * conmode is 3270 and we don't set it back then both
180		 * 3215 and the 3270 driver will try to access the console
181		 * device (3215 as console and 3270 as normal tty).
182		 */
183		cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
184		if (ptr == NULL) {
185#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
186			SET_CONSOLE_SCLP;
187#endif
188			return;
189		}
190		if (strncmp(ptr + 8, "3270", 4) == 0) {
191#if defined(CONFIG_TN3270_CONSOLE)
192			SET_CONSOLE_3270;
193#elif defined(CONFIG_TN3215_CONSOLE)
194			SET_CONSOLE_3215;
195#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
196			SET_CONSOLE_SCLP;
197#endif
198		} else if (strncmp(ptr + 8, "3215", 4) == 0) {
199#if defined(CONFIG_TN3215_CONSOLE)
200			SET_CONSOLE_3215;
201#elif defined(CONFIG_TN3270_CONSOLE)
202			SET_CONSOLE_3270;
203#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
204			SET_CONSOLE_SCLP;
205#endif
206		}
207	} else if (MACHINE_IS_KVM) {
208		if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
209			SET_CONSOLE_VT220;
210		else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
211			SET_CONSOLE_SCLP;
212		else
213			SET_CONSOLE_HVC;
214	} else {
215#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
216		SET_CONSOLE_SCLP;
217#endif
218	}
219}
220
221#ifdef CONFIG_CRASH_DUMP
222static void __init setup_zfcpdump(void)
223{
 
 
224	if (ipl_info.type != IPL_TYPE_FCP_DUMP)
225		return;
226	if (OLDMEM_BASE)
227		return;
228	strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
 
 
 
 
229	console_loglevel = 2;
230}
231#else
232static inline void setup_zfcpdump(void) {}
233#endif /* CONFIG_CRASH_DUMP */
234
235 /*
236 * Reboot, halt and power_off stubs. They just call _machine_restart,
237 * _machine_halt or _machine_power_off. 
238 */
239
240void machine_restart(char *command)
241{
242	if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
243		/*
244		 * Only unblank the console if we are called in enabled
245		 * context or a bust_spinlocks cleared the way for us.
246		 */
247		console_unblank();
248	_machine_restart(command);
249}
250
251void machine_halt(void)
252{
253	if (!in_interrupt() || oops_in_progress)
254		/*
255		 * Only unblank the console if we are called in enabled
256		 * context or a bust_spinlocks cleared the way for us.
257		 */
258		console_unblank();
259	_machine_halt();
260}
261
262void machine_power_off(void)
263{
264	if (!in_interrupt() || oops_in_progress)
265		/*
266		 * Only unblank the console if we are called in enabled
267		 * context or a bust_spinlocks cleared the way for us.
268		 */
269		console_unblank();
270	_machine_power_off();
271}
272
273/*
274 * Dummy power off function.
275 */
276void (*pm_power_off)(void) = machine_power_off;
277EXPORT_SYMBOL_GPL(pm_power_off);
278
279static int __init early_parse_mem(char *p)
280{
281	memory_end = memparse(p, &p);
282	memory_end &= PAGE_MASK;
283	memory_end_set = 1;
284	return 0;
285}
286early_param("mem", early_parse_mem);
287
288static int __init parse_vmalloc(char *arg)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
289{
290	if (!arg)
291		return -EINVAL;
292	VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
 
 
 
293	return 0;
294}
295early_param("vmalloc", parse_vmalloc);
296
297void *restart_stack __section(.data);
 
 
 
 
 
 
 
 
 
 
298
299static void __init setup_lowcore(void)
 
300{
301	struct lowcore *lc;
302
303	/*
304	 * Setup lowcore for boot cpu
305	 */
306	BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096);
307	lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc));
308	lc->restart_psw.mask = PSW_KERNEL_BITS;
309	lc->restart_psw.addr = (unsigned long) restart_int_handler;
310	lc->external_new_psw.mask = PSW_KERNEL_BITS |
311		PSW_MASK_DAT | PSW_MASK_MCHECK;
312	lc->external_new_psw.addr = (unsigned long) ext_int_handler;
313	lc->svc_new_psw.mask = PSW_KERNEL_BITS |
314		PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
315	lc->svc_new_psw.addr = (unsigned long) system_call;
316	lc->program_new_psw.mask = PSW_KERNEL_BITS |
317		PSW_MASK_DAT | PSW_MASK_MCHECK;
318	lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
319	lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
320	lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
321	lc->io_new_psw.mask = PSW_KERNEL_BITS |
322		PSW_MASK_DAT | PSW_MASK_MCHECK;
323	lc->io_new_psw.addr = (unsigned long) io_int_handler;
 
 
 
324	lc->clock_comparator = -1ULL;
325	lc->kernel_stack = ((unsigned long) &init_thread_union)
326		+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
327	lc->async_stack = (unsigned long)
328		memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE)
329		+ ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
330	lc->panic_stack = (unsigned long)
331		memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE)
332		+ PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
333	lc->current_task = (unsigned long)&init_task;
334	lc->lpp = LPP_MAGIC;
335	lc->machine_flags = S390_lowcore.machine_flags;
336	lc->preempt_count = S390_lowcore.preempt_count;
337	lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
338	memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
339	       MAX_FACILITY_BIT/8);
340	if (MACHINE_HAS_VX)
341		lc->vector_save_area_addr =
342			(unsigned long) &lc->vector_save_area;
 
 
 
 
 
 
343	lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
 
344	lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
345	lc->async_enter_timer = S390_lowcore.async_enter_timer;
346	lc->exit_timer = S390_lowcore.exit_timer;
347	lc->user_timer = S390_lowcore.user_timer;
348	lc->system_timer = S390_lowcore.system_timer;
349	lc->steal_timer = S390_lowcore.steal_timer;
350	lc->last_update_timer = S390_lowcore.last_update_timer;
351	lc->last_update_clock = S390_lowcore.last_update_clock;
352
353	restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE);
354	restart_stack += ASYNC_SIZE;
355
356	/*
357	 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
358	 * restart data to the absolute zero lowcore. This is necessary if
359	 * PSW restart is done on an offline CPU that has lowcore zero.
360	 */
361	lc->restart_stack = (unsigned long) restart_stack;
362	lc->restart_fn = (unsigned long) do_restart;
363	lc->restart_data = 0;
364	lc->restart_source = -1UL;
365
366	/* Setup absolute zero lowcore */
367	mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
368	mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
369	mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
370	mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
371	mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
372
373#ifdef CONFIG_SMP
374	lc->spinlock_lockval = arch_spin_lockval(0);
375#endif
376
377	set_prefix((u32)(unsigned long) lc);
378	lowcore_ptr[0] = lc;
379}
380
381static struct resource code_resource = {
382	.name  = "Kernel code",
383	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
384};
385
386static struct resource data_resource = {
387	.name = "Kernel data",
388	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
389};
390
391static struct resource bss_resource = {
392	.name = "Kernel bss",
393	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
394};
395
396static struct resource __initdata *standard_resources[] = {
397	&code_resource,
398	&data_resource,
399	&bss_resource,
400};
401
402static void __init setup_resources(void)
403{
404	struct resource *res, *std_res, *sub_res;
405	struct memblock_region *reg;
406	int j;
407
408	code_resource.start = (unsigned long) &_text;
409	code_resource.end = (unsigned long) &_etext - 1;
410	data_resource.start = (unsigned long) &_etext;
411	data_resource.end = (unsigned long) &_edata - 1;
412	bss_resource.start = (unsigned long) &__bss_start;
413	bss_resource.end = (unsigned long) &__bss_stop - 1;
414
415	for_each_memblock(memory, reg) {
416		res = memblock_virt_alloc(sizeof(*res), 8);
417		res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
418
419		res->name = "System RAM";
420		res->start = reg->base;
421		res->end = reg->base + reg->size - 1;
 
 
 
 
 
 
 
 
 
 
 
422		request_resource(&iomem_resource, res);
423
424		for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
425			std_res = standard_resources[j];
426			if (std_res->start < res->start ||
427			    std_res->start > res->end)
428				continue;
429			if (std_res->end > res->end) {
430				sub_res = memblock_virt_alloc(sizeof(*sub_res), 8);
431				*sub_res = *std_res;
432				sub_res->end = res->end;
433				std_res->start = res->end + 1;
434				request_resource(res, sub_res);
435			} else {
436				request_resource(res, std_res);
437			}
438		}
439	}
440#ifdef CONFIG_CRASH_DUMP
441	/*
442	 * Re-add removed crash kernel memory as reserved memory. This makes
443	 * sure it will be mapped with the identity mapping and struct pages
444	 * will be created, so it can be resized later on.
445	 * However add it later since the crash kernel resource should not be
446	 * part of the System RAM resource.
447	 */
448	if (crashk_res.end) {
449		memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
450		memblock_reserve(crashk_res.start, resource_size(&crashk_res));
451		insert_resource(&iomem_resource, &crashk_res);
452	}
453#endif
454}
455
 
 
 
456static void __init setup_memory_end(void)
457{
458	unsigned long vmax, vmalloc_size, tmp;
459
460	/* Choose kernel address space layout: 2, 3, or 4 levels. */
461	vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
462	tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
463	tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
464	if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
465		vmax = 1UL << 42;	/* 3-level kernel page table */
466	else
467		vmax = 1UL << 53;	/* 4-level kernel page table */
468	/* module area is at the end of the kernel address space. */
469	MODULES_END = vmax;
470	MODULES_VADDR = MODULES_END - MODULES_LEN;
471	VMALLOC_END = MODULES_VADDR;
472	VMALLOC_START = vmax - vmalloc_size;
473
474	/* Split remaining virtual space between 1:1 mapping & vmemmap array */
475	tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
476	/* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
477	tmp = SECTION_ALIGN_UP(tmp);
478	tmp = VMALLOC_START - tmp * sizeof(struct page);
479	tmp &= ~((vmax >> 11) - 1);	/* align to page table level */
480	tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
481	vmemmap = (struct page *) tmp;
482
483	/* Take care that memory_end is set and <= vmemmap */
484	memory_end = min(memory_end ?: max_physmem_end, tmp);
485	max_pfn = max_low_pfn = PFN_DOWN(memory_end);
486	memblock_remove(memory_end, ULONG_MAX);
487
488	pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
489}
490
491static void __init setup_vmcoreinfo(void)
492{
493	mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
494}
 
 
 
 
 
 
 
 
 
 
 
 
 
495
496#ifdef CONFIG_CRASH_DUMP
 
497
498/*
499 * When kdump is enabled, we have to ensure that no memory from
500 * the area [0 - crashkernel memory size] and
501 * [crashk_res.start - crashk_res.end] is set offline.
502 */
503static int kdump_mem_notifier(struct notifier_block *nb,
504			      unsigned long action, void *data)
505{
506	struct memory_notify *arg = data;
507
508	if (action != MEM_GOING_OFFLINE)
509		return NOTIFY_OK;
510	if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
511		return NOTIFY_BAD;
512	if (arg->start_pfn > PFN_DOWN(crashk_res.end))
513		return NOTIFY_OK;
514	if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
515		return NOTIFY_OK;
516	return NOTIFY_BAD;
517}
518
519static struct notifier_block kdump_mem_nb = {
520	.notifier_call = kdump_mem_notifier,
521};
522
523#endif
524
525/*
526 * Make sure that the area behind memory_end is protected
527 */
528static void reserve_memory_end(void)
529{
530#ifdef CONFIG_CRASH_DUMP
531	if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
532	    !OLDMEM_BASE && sclp.hsa_size) {
533		memory_end = sclp.hsa_size;
534		memory_end &= PAGE_MASK;
535		memory_end_set = 1;
536	}
537#endif
538	if (!memory_end_set)
539		return;
540	memblock_reserve(memory_end, ULONG_MAX);
541}
542
543/*
544 * Make sure that oldmem, where the dump is stored, is protected
545 */
546static void reserve_oldmem(void)
547{
548#ifdef CONFIG_CRASH_DUMP
549	if (OLDMEM_BASE)
550		/* Forget all memory above the running kdump system */
551		memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
552#endif
553}
554
555/*
556 * Make sure that oldmem, where the dump is stored, is protected
557 */
558static void remove_oldmem(void)
559{
560#ifdef CONFIG_CRASH_DUMP
561	if (OLDMEM_BASE)
562		/* Forget all memory above the running kdump system */
563		memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
564#endif
565}
566
567/*
568 * Reserve memory for kdump kernel to be loaded with kexec
569 */
570static void __init reserve_crashkernel(void)
571{
572#ifdef CONFIG_CRASH_DUMP
573	unsigned long long crash_base, crash_size;
574	phys_addr_t low, high;
575	int rc;
576
577	rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
578			       &crash_base);
579
580	crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
581	crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
582	if (rc || crash_size == 0)
583		return;
 
 
584
585	if (memblock.memory.regions[0].size < crash_size) {
586		pr_info("crashkernel reservation failed: %s\n",
587			"first memory chunk must be at least crashkernel size");
588		return;
589	}
590
591	low = crash_base ?: OLDMEM_BASE;
592	high = low + crash_size;
593	if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
594		/* The crashkernel fits into OLDMEM, reuse OLDMEM */
595		crash_base = low;
596	} else {
597		/* Find suitable area in free memory */
598		low = max_t(unsigned long, crash_size, sclp.hsa_size);
599		high = crash_base ? crash_base + crash_size : ULONG_MAX;
600
601		if (crash_base && crash_base < low) {
602			pr_info("crashkernel reservation failed: %s\n",
603				"crash_base too low");
604			return;
 
 
 
 
 
 
 
 
 
 
605		}
606		low = crash_base ?: low;
607		crash_base = memblock_find_in_range(low, high, crash_size,
608						    KEXEC_CRASH_MEM_ALIGN);
609	}
610
611	if (!crash_base) {
612		pr_info("crashkernel reservation failed: %s\n",
613			"no suitable area found");
614		return;
615	}
 
616
617	if (register_memory_notifier(&kdump_mem_nb))
618		return;
 
 
619
620	if (!OLDMEM_BASE && MACHINE_IS_VM)
621		diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
622	crashk_res.start = crash_base;
623	crashk_res.end = crash_base + crash_size - 1;
624	memblock_remove(crash_base, crash_size);
625	pr_info("Reserving %lluMB of memory at %lluMB "
626		"for crashkernel (System RAM: %luMB)\n",
627		crash_size >> 20, crash_base >> 20,
628		(unsigned long)memblock.memory.total_size >> 20);
629	os_info_crashkernel_add(crash_base, crash_size);
630#endif
631}
632
633/*
634 * Reserve the initrd from being used by memblock
635 */
636static void __init reserve_initrd(void)
637{
638#ifdef CONFIG_BLK_DEV_INITRD
639	initrd_start = INITRD_START;
640	initrd_end = initrd_start + INITRD_SIZE;
641	memblock_reserve(INITRD_START, INITRD_SIZE);
642#endif
643}
644
645/*
646 * Check for initrd being in usable memory
647 */
648static void __init check_initrd(void)
649{
650#ifdef CONFIG_BLK_DEV_INITRD
651	if (INITRD_START && INITRD_SIZE &&
652	    !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
653		pr_err("The initial RAM disk does not fit into the memory\n");
654		memblock_free(INITRD_START, INITRD_SIZE);
655		initrd_start = initrd_end = 0;
 
656	}
657#endif
658}
659
660/*
661 * Reserve memory used for lowcore/command line/kernel image.
662 */
663static void __init reserve_kernel(void)
664{
665	unsigned long start_pfn = PFN_UP(__pa(&_end));
666
667#ifdef CONFIG_DMA_API_DEBUG
668	/*
669	 * DMA_API_DEBUG code stumbles over addresses from the
670	 * range [_ehead, _stext]. Mark the memory as reserved
671	 * so it is not used for CONFIG_DMA_API_DEBUG=y.
672	 */
673	memblock_reserve(0, PFN_PHYS(start_pfn));
674#else
675	memblock_reserve(0, (unsigned long)_ehead);
676	memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
677			 - (unsigned long)_stext);
678#endif
679}
680
681static void __init setup_memory(void)
682{
683	struct memblock_region *reg;
684
685	/*
686	 * Init storage key for present memory
 
 
 
687	 */
688	for_each_memblock(memory, reg) {
689		storage_key_init_range(reg->base, reg->base + reg->size);
690	}
691	psw_set_key(PAGE_DEFAULT_KEY);
692
693	/* Only cosmetics */
694	memblock_enforce_memory_limit(memblock_end_of_DRAM());
 
 
 
 
 
 
 
 
 
 
 
 
 
 
695}
696
697/*
698 * Setup hardware capabilities.
699 */
700static int __init setup_hwcaps(void)
701{
702	static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
703	struct cpuid cpu_id;
704	int i;
705
706	/*
707	 * The store facility list bits numbers as found in the principles
708	 * of operation are numbered with bit 1UL<<31 as number 0 to
709	 * bit 1UL<<0 as number 31.
710	 *   Bit 0: instructions named N3, "backported" to esa-mode
711	 *   Bit 2: z/Architecture mode is active
712	 *   Bit 7: the store-facility-list-extended facility is installed
713	 *   Bit 17: the message-security assist is installed
714	 *   Bit 19: the long-displacement facility is installed
715	 *   Bit 21: the extended-immediate facility is installed
716	 *   Bit 22: extended-translation facility 3 is installed
717	 *   Bit 30: extended-translation facility 3 enhancement facility
718	 * These get translated to:
719	 *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
720	 *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
721	 *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
722	 *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
723	 */
724	for (i = 0; i < 6; i++)
725		if (test_facility(stfl_bits[i]))
726			elf_hwcap |= 1UL << i;
727
728	if (test_facility(22) && test_facility(30))
729		elf_hwcap |= HWCAP_S390_ETF3EH;
730
731	/*
732	 * Check for additional facilities with store-facility-list-extended.
733	 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
734	 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
735	 * as stored by stfl, bits 32-xxx contain additional facilities.
736	 * How many facility words are stored depends on the number of
737	 * doublewords passed to the instruction. The additional facilities
738	 * are:
739	 *   Bit 42: decimal floating point facility is installed
740	 *   Bit 44: perform floating point operation facility is installed
741	 * translated to:
742	 *   HWCAP_S390_DFP bit 6 (42 && 44).
743	 */
744	if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
745		elf_hwcap |= HWCAP_S390_DFP;
746
747	/*
748	 * Huge page support HWCAP_S390_HPAGE is bit 7.
749	 */
750	if (MACHINE_HAS_HPAGE)
751		elf_hwcap |= HWCAP_S390_HPAGE;
752
753	/*
754	 * 64-bit register support for 31-bit processes
755	 * HWCAP_S390_HIGH_GPRS is bit 9.
756	 */
757	elf_hwcap |= HWCAP_S390_HIGH_GPRS;
758
759	/*
760	 * Transactional execution support HWCAP_S390_TE is bit 10.
761	 */
762	if (test_facility(50) && test_facility(73))
763		elf_hwcap |= HWCAP_S390_TE;
764
765	/*
766	 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
767	 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
768	 * instead of facility bit 129.
769	 */
770	if (MACHINE_HAS_VX)
771		elf_hwcap |= HWCAP_S390_VXRS;
772	get_cpu_id(&cpu_id);
773	add_device_randomness(&cpu_id, sizeof(cpu_id));
774	switch (cpu_id.machine) {
 
 
 
 
 
 
775	case 0x2064:
776	case 0x2066:
 
777	default:	/* Use "z900" as default for 64 bit kernels. */
 
778		strcpy(elf_platform, "z900");
779		break;
780	case 0x2084:
781	case 0x2086:
782		strcpy(elf_platform, "z990");
783		break;
784	case 0x2094:
785	case 0x2096:
786		strcpy(elf_platform, "z9-109");
787		break;
788	case 0x2097:
789	case 0x2098:
790		strcpy(elf_platform, "z10");
791		break;
792	case 0x2817:
793	case 0x2818:
794		strcpy(elf_platform, "z196");
795		break;
796	case 0x2827:
797	case 0x2828:
798		strcpy(elf_platform, "zEC12");
799		break;
800	case 0x2964:
801	case 0x2965:
802		strcpy(elf_platform, "z13");
803		break;
804	}
805
806	/*
807	 * Virtualization support HWCAP_INT_SIE is bit 0.
808	 */
809	if (sclp.has_sief2)
810		int_hwcap |= HWCAP_INT_SIE;
811
812	return 0;
813}
814arch_initcall(setup_hwcaps);
815
816/*
817 * Add system information as device randomness
818 */
819static void __init setup_randomness(void)
820{
821	struct sysinfo_3_2_2 *vmms;
822
823	vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
824	if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
825		add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
826	memblock_free((unsigned long) vmms, PAGE_SIZE);
827}
828
829/*
830 * Find the correct size for the task_struct. This depends on
831 * the size of the struct fpu at the end of the thread_struct
832 * which is embedded in the task_struct.
833 */
834static void __init setup_task_size(void)
835{
836	int task_size = sizeof(struct task_struct);
837
838	if (!MACHINE_HAS_VX) {
839		task_size -= sizeof(__vector128) * __NUM_VXRS;
840		task_size += sizeof(freg_t) * __NUM_FPRS;
841	}
842	arch_task_struct_size = task_size;
843}
844
845/*
846 * Setup function called from init/main.c just after the banner
847 * was printed.
848 */
849
850void __init setup_arch(char **cmdline_p)
 
851{
852        /*
853         * print what head.S has found out about the machine
854         */
 
 
 
 
 
 
 
 
 
 
 
 
 
855	if (MACHINE_IS_VM)
856		pr_info("Linux is running as a z/VM "
857			"guest operating system in 64-bit mode\n");
858	else if (MACHINE_IS_KVM)
859		pr_info("Linux is running under KVM in 64-bit mode\n");
860	else if (MACHINE_IS_LPAR)
861		pr_info("Linux is running natively in 64-bit mode\n");
 
862
863	/* Have one command line that is parsed and saved in /proc/cmdline */
864	/* boot_command_line has been already set up in early.c */
865	*cmdline_p = boot_command_line;
866
867        ROOT_DEV = Root_RAM0;
868
869	/* Is init_mm really needed? */
870	init_mm.start_code = PAGE_OFFSET;
871	init_mm.end_code = (unsigned long) &_etext;
872	init_mm.end_data = (unsigned long) &_edata;
873	init_mm.brk = (unsigned long) &_end;
874
 
 
 
 
 
875	parse_early_param();
876#ifdef CONFIG_CRASH_DUMP
877	/* Deactivate elfcorehdr= kernel parameter */
878	elfcorehdr_addr = ELFCORE_ADDR_MAX;
879#endif
880
881	os_info_init();
882	setup_ipl();
883	setup_task_size();
884
885	/* Do some memory reservations *before* memory is added to memblock */
886	reserve_memory_end();
887	reserve_oldmem();
888	reserve_kernel();
889	reserve_initrd();
890	memblock_allow_resize();
891
892	/* Get information about *all* installed memory */
893	detect_memory_memblock();
894
895	remove_oldmem();
896
897	/*
898	 * Make sure all chunks are MAX_ORDER aligned so we don't need the
899	 * extra checks that HOLES_IN_ZONE would require.
900	 *
901	 * Is this still required?
902	 */
903	memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
904
905	setup_memory_end();
 
906	setup_memory();
907	dma_contiguous_reserve(memory_end);
908
909	check_initrd();
910	reserve_crashkernel();
911#ifdef CONFIG_CRASH_DUMP
912	/*
913	 * Be aware that smp_save_dump_cpus() triggers a system reset.
914	 * Therefore CPU and device initialization should be done afterwards.
915	 */
916	smp_save_dump_cpus();
917#endif
918
919	setup_resources();
920	setup_vmcoreinfo();
921	setup_lowcore();
922	smp_fill_possible_mask();
923	cpu_detect_mhz_feature();
924        cpu_init();
925	numa_setup();
926	smp_detect_cpus();
927	topology_init_early();
 
 
 
928
929	/*
930	 * Create kernel page tables and switch to virtual addressing.
931	 */
932        paging_init();
933
934        /* Setup default console */
935	conmode_default();
936	set_preferred_console();
937
938	/* Setup zfcpdump support */
939	setup_zfcpdump();
940
941	/* Add system specific data to the random pool */
942	setup_randomness();
943}
v3.1
  1/*
  2 *  arch/s390/kernel/setup.c
  3 *
  4 *  S390 version
  5 *    Copyright (C) IBM Corp. 1999,2010
  6 *    Author(s): Hartmut Penner (hp@de.ibm.com),
  7 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
  8 *
  9 *  Derived from "arch/i386/kernel/setup.c"
 10 *    Copyright (C) 1995, Linus Torvalds
 11 */
 12
 13/*
 14 * This file handles the architecture-dependent parts of initialization
 15 */
 16
 17#define KMSG_COMPONENT "setup"
 18#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 19
 20#include <linux/errno.h>
 21#include <linux/module.h>
 22#include <linux/sched.h>
 23#include <linux/kernel.h>
 
 24#include <linux/mm.h>
 25#include <linux/stddef.h>
 26#include <linux/unistd.h>
 27#include <linux/ptrace.h>
 
 28#include <linux/user.h>
 29#include <linux/tty.h>
 30#include <linux/ioport.h>
 31#include <linux/delay.h>
 32#include <linux/init.h>
 33#include <linux/initrd.h>
 34#include <linux/bootmem.h>
 35#include <linux/root_dev.h>
 36#include <linux/console.h>
 37#include <linux/kernel_stat.h>
 
 38#include <linux/device.h>
 39#include <linux/notifier.h>
 40#include <linux/pfn.h>
 41#include <linux/ctype.h>
 42#include <linux/reboot.h>
 43#include <linux/topology.h>
 44#include <linux/ftrace.h>
 
 
 
 45
 46#include <asm/ipl.h>
 47#include <asm/uaccess.h>
 48#include <asm/system.h>
 49#include <asm/smp.h>
 50#include <asm/mmu_context.h>
 51#include <asm/cpcmd.h>
 52#include <asm/lowcore.h>
 53#include <asm/irq.h>
 54#include <asm/page.h>
 55#include <asm/ptrace.h>
 56#include <asm/sections.h>
 57#include <asm/ebcdic.h>
 58#include <asm/compat.h>
 59#include <asm/kvm_virtio.h>
 60
 61long psw_kernel_bits	= (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
 62			   PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
 63long psw_user_bits	= (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 64			   PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 65			   PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
 66
 67/*
 68 * User copy operations.
 69 */
 70struct uaccess_ops uaccess;
 71EXPORT_SYMBOL(uaccess);
 72
 73/*
 74 * Machine setup..
 75 */
 76unsigned int console_mode = 0;
 77EXPORT_SYMBOL(console_mode);
 78
 79unsigned int console_devno = -1;
 80EXPORT_SYMBOL(console_devno);
 81
 82unsigned int console_irq = -1;
 83EXPORT_SYMBOL(console_irq);
 84
 85unsigned long elf_hwcap = 0;
 86char elf_platform[ELF_PLATFORM_SIZE];
 87
 88struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
 89
 90int __initdata memory_end_set;
 91unsigned long __initdata memory_end;
 
 
 
 
 
 
 
 
 
 
 
 
 
 92
 93/* An array with a pointer to the lowcore of every CPU. */
 94struct _lowcore *lowcore_ptr[NR_CPUS];
 95EXPORT_SYMBOL(lowcore_ptr);
 96
 97/*
 98 * This is set up by the setup-routine at boot-time
 99 * for S390 need to find out, what we have to setup
100 * using address 0x10400 ...
101 */
102
103#include <asm/setup.h>
104
105/*
106 * condev= and conmode= setup parameter.
107 */
108
109static int __init condev_setup(char *str)
110{
111	int vdev;
112
113	vdev = simple_strtoul(str, &str, 0);
114	if (vdev >= 0 && vdev < 65536) {
115		console_devno = vdev;
116		console_irq = -1;
117	}
118	return 1;
119}
120
121__setup("condev=", condev_setup);
122
123static void __init set_preferred_console(void)
124{
125	if (MACHINE_IS_KVM)
126		add_preferred_console("hvc", 0, NULL);
127	else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
128		add_preferred_console("ttyS", 0, NULL);
129	else if (CONSOLE_IS_3270)
130		add_preferred_console("tty3270", 0, NULL);
 
 
 
 
131}
132
133static int __init conmode_setup(char *str)
134{
135#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
136	if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
137                SET_CONSOLE_SCLP;
138#endif
139#if defined(CONFIG_TN3215_CONSOLE)
140	if (strncmp(str, "3215", 5) == 0)
141		SET_CONSOLE_3215;
142#endif
143#if defined(CONFIG_TN3270_CONSOLE)
144	if (strncmp(str, "3270", 5) == 0)
145		SET_CONSOLE_3270;
146#endif
147	set_preferred_console();
148        return 1;
149}
150
151__setup("conmode=", conmode_setup);
152
153static void __init conmode_default(void)
154{
155	char query_buffer[1024];
156	char *ptr;
157
158        if (MACHINE_IS_VM) {
159		cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
160		console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
161		ptr = strstr(query_buffer, "SUBCHANNEL =");
162		console_irq = simple_strtoul(ptr + 13, NULL, 16);
163		cpcmd("QUERY TERM", query_buffer, 1024, NULL);
164		ptr = strstr(query_buffer, "CONMODE");
165		/*
166		 * Set the conmode to 3215 so that the device recognition 
167		 * will set the cu_type of the console to 3215. If the
168		 * conmode is 3270 and we don't set it back then both
169		 * 3215 and the 3270 driver will try to access the console
170		 * device (3215 as console and 3270 as normal tty).
171		 */
172		cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
173		if (ptr == NULL) {
174#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
175			SET_CONSOLE_SCLP;
176#endif
177			return;
178		}
179		if (strncmp(ptr + 8, "3270", 4) == 0) {
180#if defined(CONFIG_TN3270_CONSOLE)
181			SET_CONSOLE_3270;
182#elif defined(CONFIG_TN3215_CONSOLE)
183			SET_CONSOLE_3215;
184#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
185			SET_CONSOLE_SCLP;
186#endif
187		} else if (strncmp(ptr + 8, "3215", 4) == 0) {
188#if defined(CONFIG_TN3215_CONSOLE)
189			SET_CONSOLE_3215;
190#elif defined(CONFIG_TN3270_CONSOLE)
191			SET_CONSOLE_3270;
192#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
193			SET_CONSOLE_SCLP;
194#endif
195		}
 
 
 
 
 
 
 
196	} else {
197#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
198		SET_CONSOLE_SCLP;
199#endif
200	}
201}
202
203#ifdef CONFIG_ZFCPDUMP
204static void __init setup_zfcpdump(unsigned int console_devno)
205{
206	static char str[41];
207
208	if (ipl_info.type != IPL_TYPE_FCP_DUMP)
209		return;
210	if (console_devno != -1)
211		sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
212			ipl_info.data.fcp.dev_id.devno, console_devno);
213	else
214		sprintf(str, " cio_ignore=all,!0.0.%04x",
215			ipl_info.data.fcp.dev_id.devno);
216	strcat(boot_command_line, str);
217	console_loglevel = 2;
218}
219#else
220static inline void setup_zfcpdump(unsigned int console_devno) {}
221#endif /* CONFIG_ZFCPDUMP */
222
223 /*
224 * Reboot, halt and power_off stubs. They just call _machine_restart,
225 * _machine_halt or _machine_power_off. 
226 */
227
228void machine_restart(char *command)
229{
230	if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
231		/*
232		 * Only unblank the console if we are called in enabled
233		 * context or a bust_spinlocks cleared the way for us.
234		 */
235		console_unblank();
236	_machine_restart(command);
237}
238
239void machine_halt(void)
240{
241	if (!in_interrupt() || oops_in_progress)
242		/*
243		 * Only unblank the console if we are called in enabled
244		 * context or a bust_spinlocks cleared the way for us.
245		 */
246		console_unblank();
247	_machine_halt();
248}
249
250void machine_power_off(void)
251{
252	if (!in_interrupt() || oops_in_progress)
253		/*
254		 * Only unblank the console if we are called in enabled
255		 * context or a bust_spinlocks cleared the way for us.
256		 */
257		console_unblank();
258	_machine_power_off();
259}
260
261/*
262 * Dummy power off function.
263 */
264void (*pm_power_off)(void) = machine_power_off;
 
265
266static int __init early_parse_mem(char *p)
267{
268	memory_end = memparse(p, &p);
 
269	memory_end_set = 1;
270	return 0;
271}
272early_param("mem", early_parse_mem);
273
274unsigned int user_mode = HOME_SPACE_MODE;
275EXPORT_SYMBOL_GPL(user_mode);
276
277static int set_amode_and_uaccess(unsigned long user_amode,
278				 unsigned long user32_amode)
279{
280	psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
281			PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
282			PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
283#ifdef CONFIG_COMPAT
284	psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
285			  PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
286			  PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
287	psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
288			  PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
289			  PSW32_MASK_PSTATE;
290#endif
291	psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
292			  PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
293
294	if (MACHINE_HAS_MVCOS) {
295		memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
296		return 1;
297	} else {
298		memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
299		return 0;
300	}
301}
302
303/*
304 * Switch kernel/user addressing modes?
305 */
306static int __init early_parse_switch_amode(char *p)
307{
308	user_mode = PRIMARY_SPACE_MODE;
309	return 0;
310}
311early_param("switch_amode", early_parse_switch_amode);
312
313static int __init early_parse_user_mode(char *p)
314{
315	if (p && strcmp(p, "primary") == 0)
316		user_mode = PRIMARY_SPACE_MODE;
317	else if (!p || strcmp(p, "home") == 0)
318		user_mode = HOME_SPACE_MODE;
319	else
320		return 1;
321	return 0;
322}
323early_param("user_mode", early_parse_user_mode);
324
325static void setup_addressing_mode(void)
326{
327	if (user_mode == PRIMARY_SPACE_MODE) {
328		if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
329			pr_info("Address spaces switched, "
330				"mvcos available\n");
331		else
332			pr_info("Address spaces switched, "
333				"mvcos not available\n");
334	}
335}
336
337static void __init
338setup_lowcore(void)
339{
340	struct _lowcore *lc;
341
342	/*
343	 * Setup lowcore for boot cpu
344	 */
345	BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
346	lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
347	lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
348	lc->restart_psw.addr =
349		PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
350	if (user_mode != HOME_SPACE_MODE)
351		lc->restart_psw.mask |= PSW_ASC_HOME;
352	lc->external_new_psw.mask = psw_kernel_bits;
353	lc->external_new_psw.addr =
354		PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
355	lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
356	lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
357	lc->program_new_psw.mask = psw_kernel_bits;
358	lc->program_new_psw.addr =
359		PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
360	lc->mcck_new_psw.mask =
361		psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
362	lc->mcck_new_psw.addr =
363		PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
364	lc->io_new_psw.mask = psw_kernel_bits;
365	lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
366	lc->clock_comparator = -1ULL;
367	lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 
368	lc->async_stack = (unsigned long)
369		__alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 
370	lc->panic_stack = (unsigned long)
371		__alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
372	lc->current_task = (unsigned long) init_thread_union.thread_info.task;
373	lc->thread_info = (unsigned long) &init_thread_union;
 
374	lc->machine_flags = S390_lowcore.machine_flags;
 
375	lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
376	memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
377	       MAX_FACILITY_BIT/8);
378#ifndef CONFIG_64BIT
379	if (MACHINE_HAS_IEEE) {
380		lc->extended_save_area_addr = (__u32)
381			__alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
382		/* enable extended save area */
383		__ctl_set_bit(14, 29);
384	}
385#else
386	lc->cmf_hpp = -1ULL;
387	lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
388#endif
389	lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
390	lc->async_enter_timer = S390_lowcore.async_enter_timer;
391	lc->exit_timer = S390_lowcore.exit_timer;
392	lc->user_timer = S390_lowcore.user_timer;
393	lc->system_timer = S390_lowcore.system_timer;
394	lc->steal_timer = S390_lowcore.steal_timer;
395	lc->last_update_timer = S390_lowcore.last_update_timer;
396	lc->last_update_clock = S390_lowcore.last_update_clock;
397	lc->ftrace_func = S390_lowcore.ftrace_func;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
398	set_prefix((u32)(unsigned long) lc);
399	lowcore_ptr[0] = lc;
400}
401
402static struct resource code_resource = {
403	.name  = "Kernel code",
404	.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
405};
406
407static struct resource data_resource = {
408	.name = "Kernel data",
409	.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
410};
411
412static struct resource bss_resource = {
413	.name = "Kernel bss",
414	.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
415};
416
417static struct resource __initdata *standard_resources[] = {
418	&code_resource,
419	&data_resource,
420	&bss_resource,
421};
422
423static void __init setup_resources(void)
424{
425	struct resource *res, *std_res, *sub_res;
426	int i, j;
 
427
428	code_resource.start = (unsigned long) &_text;
429	code_resource.end = (unsigned long) &_etext - 1;
430	data_resource.start = (unsigned long) &_etext;
431	data_resource.end = (unsigned long) &_edata - 1;
432	bss_resource.start = (unsigned long) &__bss_start;
433	bss_resource.end = (unsigned long) &__bss_stop - 1;
434
435	for (i = 0; i < MEMORY_CHUNKS; i++) {
436		if (!memory_chunk[i].size)
437			continue;
438		res = alloc_bootmem_low(sizeof(*res));
439		res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
440		switch (memory_chunk[i].type) {
441		case CHUNK_READ_WRITE:
442			res->name = "System RAM";
443			break;
444		case CHUNK_READ_ONLY:
445			res->name = "System ROM";
446			res->flags |= IORESOURCE_READONLY;
447			break;
448		default:
449			res->name = "reserved";
450		}
451		res->start = memory_chunk[i].addr;
452		res->end = res->start + memory_chunk[i].size - 1;
453		request_resource(&iomem_resource, res);
454
455		for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
456			std_res = standard_resources[j];
457			if (std_res->start < res->start ||
458			    std_res->start > res->end)
459				continue;
460			if (std_res->end > res->end) {
461				sub_res = alloc_bootmem_low(sizeof(*sub_res));
462				*sub_res = *std_res;
463				sub_res->end = res->end;
464				std_res->start = res->end + 1;
465				request_resource(res, sub_res);
466			} else {
467				request_resource(res, std_res);
468			}
469		}
470	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
471}
472
473unsigned long real_memory_size;
474EXPORT_SYMBOL_GPL(real_memory_size);
475
476static void __init setup_memory_end(void)
477{
478	unsigned long memory_size;
479	unsigned long max_mem;
480	int i;
 
 
 
 
 
 
 
 
 
 
 
 
481
482#ifdef CONFIG_ZFCPDUMP
483	if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
484		memory_end = ZFCPDUMP_HSA_SIZE;
485		memory_end_set = 1;
486	}
487#endif
488	memory_size = 0;
489	memory_end &= PAGE_MASK;
490
491	max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
492	memory_end = min(max_mem, memory_end);
 
 
493
494	/*
495	 * Make sure all chunks are MAX_ORDER aligned so we don't need the
496	 * extra checks that HOLES_IN_ZONE would require.
497	 */
498	for (i = 0; i < MEMORY_CHUNKS; i++) {
499		unsigned long start, end;
500		struct mem_chunk *chunk;
501		unsigned long align;
502
503		chunk = &memory_chunk[i];
504		align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
505		start = (chunk->addr + align - 1) & ~(align - 1);
506		end = (chunk->addr + chunk->size) & ~(align - 1);
507		if (start >= end)
508			memset(chunk, 0, sizeof(*chunk));
509		else {
510			chunk->addr = start;
511			chunk->size = end - start;
512		}
513	}
514
515	for (i = 0; i < MEMORY_CHUNKS; i++) {
516		struct mem_chunk *chunk = &memory_chunk[i];
517
518		real_memory_size = max(real_memory_size,
519				       chunk->addr + chunk->size);
520		if (chunk->addr >= max_mem) {
521			memset(chunk, 0, sizeof(*chunk));
522			continue;
523		}
524		if (chunk->addr + chunk->size > max_mem)
525			chunk->size = max_mem - chunk->addr;
526		memory_size = max(memory_size, chunk->addr + chunk->size);
527	}
528	if (!memory_end)
529		memory_end = memory_size;
 
 
 
 
 
 
 
530}
531
532void *restart_stack __attribute__((__section__(".data")));
 
 
 
 
533
534/*
535 * Setup new PSW and allocate stack for PSW restart interrupt
536 */
537static void __init setup_restart_psw(void)
538{
539	psw_t psw;
 
 
 
 
 
 
 
 
 
 
 
540
541	restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
542	restart_stack += ASYNC_SIZE;
 
 
 
 
 
 
 
 
 
543
544	/*
545	 * Setup restart PSW for absolute zero lowcore. This is necesary
546	 * if PSW restart is done on an offline CPU that has lowcore zero
547	 */
548	psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
549	psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
550	copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw));
 
 
 
551}
552
553static void __init
554setup_memory(void)
 
 
555{
556        unsigned long bootmap_size;
557	unsigned long start_pfn, end_pfn;
558	int i;
 
 
 
 
559
560	/*
561	 * partially used pages are not usable - thus
562	 * we are rounding upwards:
563	 */
564	start_pfn = PFN_UP(__pa(&_end));
565	end_pfn = max_pfn = PFN_DOWN(memory_end);
566
567#ifdef CONFIG_BLK_DEV_INITRD
568	/*
569	 * Move the initrd in case the bitmap of the bootmem allocater
570	 * would overwrite it.
571	 */
572
573	if (INITRD_START && INITRD_SIZE) {
574		unsigned long bmap_size;
575		unsigned long start;
576
577		bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
578		bmap_size = PFN_PHYS(bmap_size);
579
580		if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
581			start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
582
583			if (start + INITRD_SIZE > memory_end) {
584				pr_err("initrd extends beyond end of "
585				       "memory (0x%08lx > 0x%08lx) "
586				       "disabling initrd\n",
587				       start + INITRD_SIZE, memory_end);
588				INITRD_START = INITRD_SIZE = 0;
589			} else {
590				pr_info("Moving initrd (0x%08lx -> "
591					"0x%08lx, size: %ld)\n",
592					INITRD_START, start, INITRD_SIZE);
593				memmove((void *) start, (void *) INITRD_START,
594					INITRD_SIZE);
595				INITRD_START = start;
596			}
597		}
 
 
 
 
 
 
 
 
 
598	}
599#endif
600
601	/*
602	 * Initialize the boot-time allocator
603	 */
604	bootmap_size = init_bootmem(start_pfn, end_pfn);
605
606	/*
607	 * Register RAM areas with the bootmem allocator.
608	 */
 
 
 
 
 
 
 
 
 
609
610	for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
611		unsigned long start_chunk, end_chunk, pfn;
 
 
 
 
 
 
 
 
 
612
613		if (memory_chunk[i].type != CHUNK_READ_WRITE)
614			continue;
615		start_chunk = PFN_DOWN(memory_chunk[i].addr);
616		end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
617		end_chunk = min(end_chunk, end_pfn);
618		if (start_chunk >= end_chunk)
619			continue;
620		add_active_range(0, start_chunk, end_chunk);
621		pfn = max(start_chunk, start_pfn);
622		for (; pfn < end_chunk; pfn++)
623			page_set_storage_key(PFN_PHYS(pfn),
624					     PAGE_DEFAULT_KEY, 0);
625	}
 
 
626
627	psw_set_key(PAGE_DEFAULT_KEY);
628
629	free_bootmem_with_active_regions(0, max_pfn);
 
 
 
630
 
631	/*
632	 * Reserve memory used for lowcore/command line/kernel image.
 
 
633	 */
634	reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
635	reserve_bootmem((unsigned long)_stext,
636			PFN_PHYS(start_pfn) - (unsigned long)_stext,
637			BOOTMEM_DEFAULT);
 
 
 
 
 
 
 
 
638	/*
639	 * Reserve the bootmem bitmap itself as well. We do this in two
640	 * steps (first step was init_bootmem()) because this catches
641	 * the (very unlikely) case of us accidentally initializing the
642	 * bootmem allocator with an invalid RAM area.
643	 */
644	reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
645			BOOTMEM_DEFAULT);
 
 
646
647#ifdef CONFIG_BLK_DEV_INITRD
648	if (INITRD_START && INITRD_SIZE) {
649		if (INITRD_START + INITRD_SIZE <= memory_end) {
650			reserve_bootmem(INITRD_START, INITRD_SIZE,
651					BOOTMEM_DEFAULT);
652			initrd_start = INITRD_START;
653			initrd_end = initrd_start + INITRD_SIZE;
654		} else {
655			pr_err("initrd extends beyond end of "
656			       "memory (0x%08lx > 0x%08lx) "
657			       "disabling initrd\n",
658			       initrd_start + INITRD_SIZE, memory_end);
659			initrd_start = initrd_end = 0;
660		}
661	}
662#endif
663}
664
665/*
666 * Setup hardware capabilities.
667 */
668static void __init setup_hwcaps(void)
669{
670	static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
671	struct cpuid cpu_id;
672	int i;
673
674	/*
675	 * The store facility list bits numbers as found in the principles
676	 * of operation are numbered with bit 1UL<<31 as number 0 to
677	 * bit 1UL<<0 as number 31.
678	 *   Bit 0: instructions named N3, "backported" to esa-mode
679	 *   Bit 2: z/Architecture mode is active
680	 *   Bit 7: the store-facility-list-extended facility is installed
681	 *   Bit 17: the message-security assist is installed
682	 *   Bit 19: the long-displacement facility is installed
683	 *   Bit 21: the extended-immediate facility is installed
684	 *   Bit 22: extended-translation facility 3 is installed
685	 *   Bit 30: extended-translation facility 3 enhancement facility
686	 * These get translated to:
687	 *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
688	 *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
689	 *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
690	 *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
691	 */
692	for (i = 0; i < 6; i++)
693		if (test_facility(stfl_bits[i]))
694			elf_hwcap |= 1UL << i;
695
696	if (test_facility(22) && test_facility(30))
697		elf_hwcap |= HWCAP_S390_ETF3EH;
698
699	/*
700	 * Check for additional facilities with store-facility-list-extended.
701	 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
702	 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
703	 * as stored by stfl, bits 32-xxx contain additional facilities.
704	 * How many facility words are stored depends on the number of
705	 * doublewords passed to the instruction. The additional facilities
706	 * are:
707	 *   Bit 42: decimal floating point facility is installed
708	 *   Bit 44: perform floating point operation facility is installed
709	 * translated to:
710	 *   HWCAP_S390_DFP bit 6 (42 && 44).
711	 */
712	if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
713		elf_hwcap |= HWCAP_S390_DFP;
714
715	/*
716	 * Huge page support HWCAP_S390_HPAGE is bit 7.
717	 */
718	if (MACHINE_HAS_HPAGE)
719		elf_hwcap |= HWCAP_S390_HPAGE;
720
721	/*
722	 * 64-bit register support for 31-bit processes
723	 * HWCAP_S390_HIGH_GPRS is bit 9.
724	 */
725	elf_hwcap |= HWCAP_S390_HIGH_GPRS;
726
 
 
 
 
 
 
 
 
 
 
 
 
 
727	get_cpu_id(&cpu_id);
 
728	switch (cpu_id.machine) {
729	case 0x9672:
730#if !defined(CONFIG_64BIT)
731	default:	/* Use "g5" as default for 31 bit kernels. */
732#endif
733		strcpy(elf_platform, "g5");
734		break;
735	case 0x2064:
736	case 0x2066:
737#if defined(CONFIG_64BIT)
738	default:	/* Use "z900" as default for 64 bit kernels. */
739#endif
740		strcpy(elf_platform, "z900");
741		break;
742	case 0x2084:
743	case 0x2086:
744		strcpy(elf_platform, "z990");
745		break;
746	case 0x2094:
747	case 0x2096:
748		strcpy(elf_platform, "z9-109");
749		break;
750	case 0x2097:
751	case 0x2098:
752		strcpy(elf_platform, "z10");
753		break;
754	case 0x2817:
755	case 0x2818:
756		strcpy(elf_platform, "z196");
757		break;
 
 
 
 
 
 
 
 
758	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
759}
760
761/*
762 * Setup function called from init/main.c just after the banner
763 * was printed.
764 */
765
766void __init
767setup_arch(char **cmdline_p)
768{
769        /*
770         * print what head.S has found out about the machine
771         */
772#ifndef CONFIG_64BIT
773	if (MACHINE_IS_VM)
774		pr_info("Linux is running as a z/VM "
775			"guest operating system in 31-bit mode\n");
776	else if (MACHINE_IS_LPAR)
777		pr_info("Linux is running natively in 31-bit mode\n");
778	if (MACHINE_HAS_IEEE)
779		pr_info("The hardware system has IEEE compatible "
780			"floating point units\n");
781	else
782		pr_info("The hardware system has no IEEE compatible "
783			"floating point units\n");
784#else /* CONFIG_64BIT */
785	if (MACHINE_IS_VM)
786		pr_info("Linux is running as a z/VM "
787			"guest operating system in 64-bit mode\n");
788	else if (MACHINE_IS_KVM)
789		pr_info("Linux is running under KVM in 64-bit mode\n");
790	else if (MACHINE_IS_LPAR)
791		pr_info("Linux is running natively in 64-bit mode\n");
792#endif /* CONFIG_64BIT */
793
794	/* Have one command line that is parsed and saved in /proc/cmdline */
795	/* boot_command_line has been already set up in early.c */
796	*cmdline_p = boot_command_line;
797
798        ROOT_DEV = Root_RAM0;
799
 
800	init_mm.start_code = PAGE_OFFSET;
801	init_mm.end_code = (unsigned long) &_etext;
802	init_mm.end_data = (unsigned long) &_edata;
803	init_mm.brk = (unsigned long) &_end;
804
805	if (MACHINE_HAS_MVCOS)
806		memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
807	else
808		memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
809
810	parse_early_param();
 
 
 
 
811
 
812	setup_ipl();
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
813	setup_memory_end();
814	setup_addressing_mode();
815	setup_memory();
 
 
 
 
 
 
 
 
 
 
 
 
816	setup_resources();
817	setup_restart_psw();
818	setup_lowcore();
819
 
820        cpu_init();
821	s390_init_cpu_topology();
822
823	/*
824	 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
825	 */
826	setup_hwcaps();
827
828	/*
829	 * Create kernel page tables and switch to virtual addressing.
830	 */
831        paging_init();
832
833        /* Setup default console */
834	conmode_default();
835	set_preferred_console();
836
837	/* Setup zfcpdump support */
838	setup_zfcpdump(console_devno);
 
 
 
839}